Liquid level sensor HT-75-P
They are used wherever it is necessary to control and regulate the level of liquids (e.g. water, oil, etc.). The sensor has a float equipped with a magnet that moves vertically along the guide tube under the influence of the buoyancy force of the liquid, causing the reed switch to short circuit or open. They are usually mounted in the bottom or lid of the tank, so they can be used to control the lower or upper level of the liquid. By changing the position of the float, the function of the reed switch is changed from short-circuited to open-circuited.Made of stainless steel with the possibility of use in a wide range of temperatures.
|Max. switching voltage
|Max. switching current
||-10 ~ +85 °C
||External thread with nut M10
||PZH certificate - approved for contact with drinking water
The design of the sensor does not allow the connection of 230V mains voltage, so for powering the sensors it is recommended to use AFR 1 relay with built-in safe source of 8VAC voltage or 24V DC control voltage.
Example of application
The sensors have a magnet fixed in the float, which, when raised, causes the contact of the reed switch to short or open. Thus, the sensors can operate as NC normally closed or NO - normally open, i.e. on or off. Changing the mode of operation is achieved by rotating the float by 180°. See below photo:
- high state: on
- low state: off
- high state: off
- low state: on
Utilize a relay to keep the liquid level in the tank at any level, high or low.
Relay AFR1 Allows both actuation of an actuating device (e.g., pump, solenoid valve) and powering up to two sensors with low control voltage.